Device for automatically stripping cutout box blanks from offal or waste



Apnl 29, 1952 H. A. RINGEL 2,594,804

DEVICE FOR AUTOMATICA ST PING CUTOUT BOX BLANKS FROM AL WASTE Filed Dec. 5, 1946 3 Sheets$ heet 2 IN VEN TOR. HAEOLDA. BIA/GEL April 29, 1952 H A RING EL DEVICE FOR AUTOMATICALLY STRIPPING CUTOUT BOX- BLANKS FROM OFFAL 0R WASTE File'd Dec. 5, 1946 3 Sheets-Sheet 5 EQQ A/AKOZAZ YZQ WG ZZ ATTO IENEYS Patented Apr. 29, 1952 DEVICE FOR AUTOMATICALLY STRIPPING CUTOUT BOX BLANKS FROM OFFAL OR TASTE Harold A. Ringel, New (ll-leans, La.

Application December 5, 1946, Serial No. 714,292

(Cl. 933G) 11 Claims. 1

The present invention relates to improvements in a device for automatically stripping cut-out box blanks from oiial or waste and has for an object to provide an improved device for submitting a creased or scored sheet of cardboard stock to the action of selective suction rolls for the purpose of drawing out and separating the definitive box blank upon one roll and drawing out and separating the ofial or waste from the cardboard sheet to and upon the other roll to the end that the blank may be delivered to the appropriate setting up mechanism and the offal or Waste conveyed separately to a disposal point.

Another object of the invention is to so construct and relatively arrange the parts of the improved device that it acquires an unitary character enabling the same to be introduced as a separate attachment to paper box making machines cr built directly into the machine as an original and integral part thereof functioning concomitantly with the other agents of the paper box making machine.

A further object of the invention is to provide an improved device of the character indicated adapted for automatic separating operation by the use of suction for causing adherence of the respective box blanks and waste portions of the cardboard sheet to the opposed rolls and in which the parts are so relatively arranged as to receive the cardboard stock or other material preliminarily cut and scored from a cutting or creasing press or the like.

A still further object of the invention is to provide a device designed for a considerable saving of labor due to the elimination of hand strippers and extra handling of finished articles or waste.

A still further object of the invention resides in the fact that the improved automatic stripping device eliminates tearing and breaking of the boxes, or other articles cut out from the blanks, which occurs frequently in hand stripping due to the use of hammers, punches and other implements all as are well known in the trade; and hence the use of the invention will result in appreciable saving of material.

. 4 A still further object of the present invention is to provide an improved automatic stripping device which will permit cleaner cuts to be made on the sheet of material used, due to the fact that the sheet is not handled and the components will not fall apart and the cut-out boxes or other aruse of special stripping tables and stripping departments which have heretofore consumed a large amount of floor space.

With the foregoing and other objects in View, the invention will be more fully described hereinafter and more particularly pointed out in the appended claims.

In the drawings, in which like parts are denoted by the same reference characters throughout the several views,

Figure 1 is a vertical section taken on the line l--! in Figure 2 and. illustrating an improved stripping device as constructed in accordance with the present invention.

Figure 2 is a vertical section taken longitudinally through the device on the line 22 in Figure 1.

Figure 3 is a perspective view of one of the stationary adjustable shutters of one of the stripping rolls.

Figure 4 is a perspective view of a form of cyl inder with exploded ends and make-ready pattern.

Figure 5 is a perspective view of a stationary adjustable shutter as employed with a transfer roll.

Figure 6 is a perspective view of such transfer roll.

Figure '7 is a plan view of a form of make-ready pattern for the lower perforated cylinder.

Figure 8 is a similar view of a form of makeready pattern for the upper perforated cylinder.

Referring more particularly to the drawings, the cut-out sheet of cardboard, paper, or similar material, designated at 5! in Figure l is fed from the cutting and creasing press (not shown) to the slide board 59 on which it slides down and is directed between the register rolls 48 and 49. These register rolls are driven by power and although they are not in motion when the cutout sheet 5! contacts them, the driving unit is timed to start the register rollers in motion and pull the cut-out sheet through them and feed the cut-out sheet 5| onto a platform I! and thence to'the nip between rotary cylinders ii! and H at the proper time to register the cut-out sheet 5| with the make-readys on the cylinders l0 and l l which are driven by power and are revolving at all times when the cutting and creasing press is in operation. These cylinders It and I l are driven at a speed or" one complete revolution every time a cut-out sheet is delivered from the cutting and creasing press. 39 when in motion must revolve at the same peripheral speed as the cylinders it and II. The

The register rollers 48 and cylinders as hereinafter described have per-= forated sections subject to suction over which make-ready patterns are affixed conforming in the case of one cylinder to the box blanks and in the case of the other cylinder to the offal or waste as laid out on the sheet being cut out; the balance of the perforated sections on both cylinders, over the outside size of the cut-out sheet, are covered with a solid sheet of paper or cardboard to prevent loss of suction at these sections of the perforations; whereby the box blanks will be separated from such offal or waste and ultimately delivered to separate conveyors 55 and 56 for transfer to their separate destinations.

The cylinders l9 and H are alike in construction except for the formation of the make ready patterns carried thereby, and their internal construction with suction means are also alike so that a description of one will suffice for both.

Referring more particularly to Figures 3 and 4, the outer surface of the rotary cylinder is shown as made in two sections I4 and I5 rabbeted or lapped together as indicated at I6 and le and secured together by countersunk head machine screws [5b so that the perforated section It can be conveniently removed for cleaning. One section H3 is perforated while the other section '5 constitues a blank imperforate wall. End heads is are removably mounted in the ends of the cylinder Ill and are removably secured in place as by countersunk head screws or other fastenings 63 entering perforations 64 in the end portion of the cylinder and screwed home in the threaded sockets (i5 in the peripheral edges of the end heads l9. These end heads I9 are perforated centrally in register with the bores of hollow trunnions l1 and I8. The length across the cylinders l0 and H is the same length as the cylinders of the cutting and creasing press, and the circumference of the cylinders H) and l I is twice the size of the maximum sheet that can be fed around the cylinder on the cutting and creasing press (not shown) used in conjunction with the present invention. The circumferential surface of the cylinders l0 and H comprises the two equal sized sections I4 and I5.

W'ithin the cylinders l0 and II are stationary shutters l2 and I3. Figure 3 shows one shutter which is identical in construction with the other shutter. solid piece of material cut into shape as Figure 3 or may be hollow and composed generally of a part cylindrical plate 2| closed at its ends by discs 22 which carry hollow stub shafts 23 and 24 of an external diameter to closely fit the internal diameters of the bores 20 of the trunnions H and iii of the cylinder ID. The cylinder [0 is supported for relative rotation upon and about the circumferential wall 2 I. while the trunnions if and iii are supported for rotation upon the stub shafts 23 and 24. The end discs 22 of the shutter l2 engage against the end heads 19 of the cylinder and prevent endwise play relatively between the cylinder and shutter. The hollow stub shafts 23 and 24 are longer axially than the trunnions H and I8 and as shown in Figure 2 project outwardly beyond such trunnions H and IS for support of the entire unit in the side frames of the machine. The exposed portions of the stub shafts 23 and 24 are affixed against rotation in the frame 19 as by the use of splines 18.

The shutter is formed with a removed sector defined by the radial walls 25 and 26 which are afiixed to the circumferential wall or plate 21 Such shutter 12 may be made of one and the end discs 22 and converge centrally to the suction tube 28 having openings 21 which place the sector space in communication with a source of suction supply. For instance, in Figures 1 and 2 a suction pipe i2 is shown communicating with the internal bores 29 of the stub shafts 23, such suction pipe i2 connecting with a suction pump 74 driven by an electric or other motor iii. One or both end heads 19 of the cylinder It may be removed for the purpose of introducing the nonrotary shutter 12 into the cylinder. This shutter l2 will be of less axial length from ,end disc 22 to end disc by the combined thickness of the two end heads 19 of the cylinder whereby when the shutter I2 is introduced into the cylinder or the cylinder is slipped over the shutter and the end discs slipped axially over the stud shafts 23 and 24 and finally secured in place by the fastenings 63, the discs 21 will come substantially up against the inside surfaces of the end heads l9 and such heads thus function to take up the axial thrust of the shutter within the cylinder.

The angular size of the cut-out sector or open zone in the shutters l2 and I3 may vary for different types and weights of material but will in most cases be from one-eighth to three-eighths of the circumference. While the shutters l2 and 43 are identical in construction, in mounting the same fixedly in the machine frame 79, the removed or cut-out sectors of the two cylinders are differentially placed in an angular sense whereby the origin portions of the zones will both be disposed at substantially the nip between the two cylinders is and H. The cut-out sector of the upper shutter 12 progresses around from the nip counterclockwise for a suitable distance to carry the cut-out box blanks to the transfer suction roll 30. The lower cut-out sector or suction zone of the shutter l3 progresses from the origin point at the nip in a clockwise direction for a suitable distance to carry the offal or waste to the transfer suction roll 31.

A mechanical finger or dividing member 5? has a knife edge 68 entering closely between the cylinders I0 and H in proximity to the nip between the same and upon the delivery side of the nip to penetrate between the box blank and the offal or waste. This member 5'! is formed with curved sides 69 and it which are concentric respectively with the cylinders ill and H and lie outwardly beyond the outer peripheries of such cylinders by a distance sufiicient to accommodate respectively the now separated box blank 52 and offal or waste 53. l

Make-ready patterns and 67 cut out of cardboard or similar material to conform with the particular form of the box blanks and offal or waste respectively are illustrated in Figures 7 and 8 and are adapted to be glued or otherwise attached over the perforated sections I4 of the cylinders If! and II respectively whereby the suction produced in the removed sector of the upper shutter 12 will be exerted only through the cut-out portions of the make-ready pattern 66 and will thus attract the box blank to the moving periphery of the upper roll l6 while having no effect on the oifal or waste which, however, is the only part of the paper stock which is subject to the suction in the removed sector of the lower pattern 13 and is thus attracted to the periphery of the lower rotating cylinder H.

The box blank is peeled or removed from its adherent condition on the surface of the cylinder I0 after suction is cut oif by the shutter at terminal'poi ntor wall 25, by any suitable means, for instance by a scraper or doctor 58 having a knife edge I disposed very close to the periphery of the cylinder ID at a point somewhat beyond the terminal edge of the suction sector of the upper shutter l2. This scraper 58 may be used singly or combination with a suction roll 30 or the suction roll 30 may be employed without the aid of the scraper 58.

'In a similar way a scraper 83 is employed in conjunction with the lower cylinder l3 for Jpe'eling or removing the offal or waste 53 from the periphery of the lower cylinder I after suction is cut off by the shutter terminal point or wall '26. This scraper 68 may be located just at or beyond the terminal point or wall 26 of the removed suction sector of the lower shutter l3. A suction rol l 3| may be employed for the same purpose either alone or in conjunction with the scraper 63.

The suction rolls 3i! and 3! may be identical in construction. One such roll is shown in Figures 5 and 6. The diameter of the rolls may be approximately one-fourth of the diameter of the hollow cylinders i3 and ii. The outer rolls 30 and 3| which are rotary contain stationary shutters 33 and 34. The suction rolls are driven by power and must revolve at the same peripheral speed as the cylinders and II.

Referring more particularly to Figures 5 and 6, the roll 30 is a cylinder having a continuously circular perforated wall so that the same may be made out of a single flat piece of material curved in the necessary diameter and having the rabbeted lap edges 62 secured together by rivets or a weld or in any suitable manner. The ends of the roll 30 are closed by removable discs 45 held in place in the roll by appropriate fastenings and having the hollow trunnions 32 projecting therefrom.

As shown in Figure 5 the stationary shutter 33 comprises the part-cylindrical plate or wall 36, the end discs 31 and the radial walls 49 and 4| which define the removed sector or suction zone which communicates through openings 42 with an axial suction tube 43. Stub shafts 45 and 4? project outwardly from the discs 31. One or both such stub shafts may be formed with a bore 44 communicating with the suction tube 43 and also connecting by a pipe 13 with the suction pump 14. Oneor both of the stub shafts 46 and 41 is of a length in excess of the axial length of the hollow trunnions 32 in order to fit through, form a support for, and extend beyond such trunnions 32 to be accommodated and supported in the frame i9 and 'a'fiixed thereto as by the use of a spline or other fastening.

Suction rolls 3i) and 3| are rotatably mounted upon their respective fixed shutters 33 and 34 and the perforated peripheries of the suction rolls are exposed throughout their entire lengths to the influence of the suction as the rolls rotate past the suction zones or removed sectors of their respective fixed shutters 33 and 34. The origin point of the upper fixed shutter 33 is circumferentially beyond the terminal point of the suction area of the fixed shutter l2 while the terminal point of the suction zone of the shutter 33 terminates adjacent a knife edge or scraper 55 carried by a platform or bridge between the suction roll 33 and the receiving end of the conveycr 55.

In a similar way the suction zone of the lower fixed shutter 34 has its initial point at or beyond the terminal point of the suction zone of the lower main shutter i3 and adjacent the scraper 60. A scraper 5| is arranged at or just beyond 7 paper or Similar stock material BI is fed from the.

cutting and "creasing press to the, slide board by which it is diverted to the register rolls 48 and 43. The two register rolls 4%! and 49 revolve only to feed the cut-out sheet to the hollow cylinders l3 and H in time to register in proper position of the cylinders and to stop revolving after the entire sheet is fed to the cylinders before the next sheet is delivered to them. This insures that the box blank and the offal or waste accuratel'y register with the cut-out portions of the make-ready patterns 66 and 61. The material 5| is pushed along platform or bridge 11 and into the nip between the cylinders l0 and immediately coming under the influence of the suction of the two shut-ters l2 and 13. Due to the makeready patterns the box blank will be sucked upwardly causing the same to adhere to the upper cylinder Ill while the offal or waste is sucked downwardly and caused to adhere to the lower cylinder The knife edge 63 facilitates this division and the curved walls 59 and 10 require the separated portions of the original stock to rotate around with the cylinders I0 and When the box blank reaches the end of the suction Zone of the upper shutter l2, it will be removed from the cylinder ID by the single or conjoint action of the scraper 58 and the suction roll 3|). The latter roll 30 will draw the blank 52 to its surface and require the blank to be rotated around until release of suction by terminal point or wall on shutter and removed by the scraper 59. Here it will be received on the platform 16 and moved along to the conveyor 55.

The olial or waste 53 will c1ing to the lower cylinder until it passes beyond the terminal point 23 of the suction zone of the lower shutter 3 at which time it will come under the influence of the suction zone of the lower suction roller 3| being carried about the surface of the roller 3| until release of suction by terminal point or wall on shutter and then deflected by the scraper 6-1 and its curved wall to the conveyor 53. The scraper 69 assists in this operation.

If desired, the rolls ID and H may be driven by any suitable mechanism as may also the register rolls 48 and 48; and if desired, a timing gear mechanism may be connected between the two drives in order to synchronize the actions of the rolls and cylinders to insure that the box blank and tidal or waste always register with the make ready pattern strip 66 and 6?.

t is obvious that various changes and modificatio'ns may be made in the details of construction and design of the above specifically described embodiment of this invention without departing from the spirit thereof, such changes and modifications being restricted only by the scope of the following claims.

I claim:

1. In a device for automatically stripping cutout box blanks from waste, a pair of hollow oppositel'y rotating cylinders disposed with a hip therebet'ween of the approximate thickness of the cut-out "sheet of cardboard having the box blank and waste material, said cylinders each comprising perforated and imperforate partcylindrical sections, make-ready patterns affixed to the perforated portions of each cylinder, the pattern on one cylinder conforming to the box blank and the pattern on the other cylinder to the waste, stationary shutters in the cylinders each comprising a part-cylindrical wall fitting closely within its respective cylinder and on which the cylinder rotates, each of said shutters having a sector shaped cut away portion the origin point of which is arranged substantially at the nip between the cylinders and extending from the origin point angularly in the direction of rotation of its respective cylinder, the cut away portion of each shutter cooperating with its respective cylinder to provide a sector shaped space in communication with a source of vacuum, and means at the terminal points of the sectors for stripping respectively the separated box blanks and waste from the perforated portions of the cylinders.

2. In a device for automatically stripping cutout box blanks from waste, a pair of hollow oppositely rotating cylinders disposed with a nip therebetween of the approximate thickness of the cut-out sheet of cardboard having the box blank and waste material, said cylinders each having perforated part-cylindrical sections, make-ready patterns affixed to the perforated sections of each cylinder, the: pattern on one cylinder conforming to the box blank and the pattern on the other cylinder to the waste, stationary shutters in the cylinders each comprising a part-cylindrical wall, each of said shutters having a sector shaped cut away portion the origin point of which is arranged substantially at the nip between the cylinders and extending from the origin point angularly in the direction of rotation of its respective cylinder, the cut away portion of each shutter cooperating with its respective cylinder to provide a sector shaped space in communication with a source of vacuum, and means at the terminal points of the sectors for separately stripping respectively the separated box blanks and waste from the perforated portions of the cylinders.

3. In a device for automatically stripping cutout box blanks from waste, a pair of hollow oppositely rotating cylinders disposed with a nip therebetween of the approximate thickness of the cut-out sheet of cardboard having the box blank and waste material, said cylinders each comprising separable perforated and imperiorate part-cylindrical wall sections, end heads fitting into the end portions of said wall sections, fastening means for securing the wall sections together upon said heads, make-ready patterns affixed to the perforated portions of each of said cylinders, the pattern on one cylinder conforming to the box blank and the pattern on the other cylinder to the waste, stationary shutters in the cylinders having blank cylindrical wall portions, each of said shutters having a sector shaped cut away portion the origin point of which is arranged substantially at the nip between the cylinders and extending from the origin point angularly in the direction of rotation of its respective cylinder, the cut away portion of each shutter cooperating with its respective cylinder to provide a sector shaped space in communication with a source of vacuum, and means at the terminal points of the sectors for separately stripping respectively the separated box blanks and waste from the perforated portions of the cylinders.

4. In a device for automatically stripping cutout box blanks from waste, a pair of hollow oppositely rotating cylinders disposed with a nip therebetween of the approximate thickness of the cut-out sheet of cardboard having the box blank and waste material, said cylinders having perforated part-cylindrical sections, makeready patterns aflixed to the perforated portions of each cylinder, the pattern on one cylinder conforming to the box blank and the pattern on the other cylinder to the Waste, stationary shutters in the cylinders each comprising a part-cylindrical well, each of said shutters hav-- ing a sector shaped cut away portion the origin point of which is arranged substantially at the nip between the cylinders and extending from the origin point angularly in the direction of rotation of its respective cylinder, the cut away portion of each shutter cooperating with its respective cylinder to provide a sector shaped space in communication with a source of vacuum, hollow trunnions on the shutters communicating with the removed sector spaces or" the respective shutters, a frame in which said trunnions are affixed, a source of vacuum connected with said hollow trunnions, and means at the terminal points of the sectors for separately stripping respectively the separated box blanks and waste from the perforated portions of the cylinders.

5. A device for automatically stripping cutout box blanks from waste as claimed in claim 2 in which said cylinders relatively rotate about their respective shutters and each shutter is angularly adjustable within its respective cylinder to vary the position of the cut away portion with relation to the nip between the cylinders.

6. A device for automatically stripping cutout box blanks from waste according to claim 2 further comprising trunnions on the stationary shutters, a frame in which the outer end portions of said trunnions are fixedly received, and hollow trunnions on the cylinders rotatably supported on the tmnnions of the respective shutters.

'7. A device for automatically stripping cutout box blanks from waste according to claim 2 in which the areas of the perforated portions of the cylinders are co-extensive with the largest size of cardboard sheet used, further comprising means for detachably securing the make-ready patterns to the perforated portions of the cylinders.

8. A device for automatically stripping cutout box blanks from waste according to claim 2 further comprising end heads for said cylinders, hollow trunnions projecting from said heads, hollow trunnions of smaller diameter than the cylinder trunnions projecting from the ends of said shutters and on which said cylinder heads are mounted to rotate, said shutter journal being longer than the cylinder journals and projecting outwardly of the cylinder journal, a frame having means to non-rotatably receive and support the outer ends of said shutter journal, said hollow shutter journals communicating with the sector spaces, and means for connecting said hollow shutter trunnions with the source of vacuum.

9. A device for automatically stripping cutout box blanks from waste according to claim 2 further comprising a dividing member having a knife edge entering closely between the cylinders in proximity to the nip and upon the delivery side of the nip to penetrate between the box blank and waste as the sameare attracted by the suction against the perforated portions of their respective cylinders, said dividing member having curved sides substantially concentric with the respective cylinders and spaced away from the wall sections of said cylinders by a space suflicient to accommodate respectively the separated box blanks and waste.

10. A device for automatically stripping cutout box blanks from waste as claimed in claim 2 in which the last-named means comprises scrapers having knife edges extending oppositely to the direction of rotation of the cylinders and positioned one each at that portion of the wall section of its cylinder approximately opposite the terminal point of the respective cut away portion.

11. A device for automatically stripping cutout box blanks from waste according to claim 2 in which said last-named means comprises rotaof the cylinders.

HAROLD A. RINGEL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,034,694 Dausmann Mar. 24, 1936 2,202,496 La Bombard May 28, 1940 2,257,829 Winkler et a1. Oct. 7, 1941 

